<template>
  <header class="header">
    <!-- 头部的第一行 -->
    <div class="top">
      <div class="container">
        <div class="loginList">
          <p>尚品汇欢迎您！</p>
          <p v-if="!nickName">
            <span>请</span>
            <router-link to="/login">登录</router-link>
            <router-link to="/register" class="register">免费注册</router-link>
          </p>
          <p v-else>
            <a >{{nickName}}</a>
            <a class="register" @click="logout" >退出登录</a>
          </p>
        </div>
        <div class="typeList">
          <router-link to="/center">我的订单</router-link>
          <router-link to="/shopcart"> 我的购物车</router-link>
          <a href="###">我的尚品汇</a>
          <a href="###">尚品汇会员</a>
          <a href="###">企业采购</a>
          <a href="###">关注尚品汇</a>
          <a href="###">合作招商</a>
          <a href="###">商家后台</a>
        </div>
      </div>
    </div>
    <!--头部第二行 搜索区域-->
    <div class="bottom">
      <h1 class="logoArea">
        <router-link class="logo" title="尚品汇" to="/home">
          <img src="./images/logo.png" alt="" />
        </router-link>
      </h1>
      <div class="searchArea">
        <form action="###" class="searchForm">
          <input
            type="text"
            id="autocomplete"
            class="input-error input-xxlarge"
            v-model="keyword"
          />
          <button
            class="sui-btn btn-xlarge btn-danger"
            type="button"
            @click="goSearch"
          >
            搜索
          </button>
        </form>
      </div>
    </div>
  </header>
</template>

<script>
import {mapState} from 'vuex'
export default {
  name: "Header",
  data() {
    return {
      keyword: "",
    };
  },
  methods: {
    goSearch() {
      //第一种字符串写法
      // this.$router.push("/search");
      // this.$router.push("/search?a=1&keyword="+this.keyword);
      // this.$router.push('/search/1/'+this.keyword);
      //第二种模板字符串
      //  this.$router.push(`/search/${this.keyword}?a=1`)
      //第三种对象写法
      //this.$router.push({path:'/search'});//没有携带参数
      // this.$router.push({path:'/search',query:{a:1,keyword:this.keyword}});
      // this.$router.push({name:'search',params:{keyword:this.keyword},query:{a:1}})


      
      //测试面试题第一题:params可以传递也可以不传递 ?????????????
      // this.$router.push({name:'search',params:{keyword:'daxue'}})
          //测试面试题第二题:
      //如果params参数可以传递也可以不传递[万万不能传递空串，导致URL发生错误]
      //  this.$router.push({name:'search',params:{keyword:this.keyword || undefined}})

      //只要点击搜索按钮:携带只有params参数
       let locations = {
        name:'search',
        params:{keyword:this.keyword || undefined},
       };
       //如果query参数有:携带，没有携带空对象
       locations.query = this.$route.query;
       this.$router.push(locations);

      //底下代码可以验证:push里面this需要保证是VueRouter类的实例才可以路由跳转与传递参数
      //如果push方法this变为undefined会报错：undefined.history报错
      //  let push = this.$router.push;
      //  push({name:'search',params:{keyword:this.keyword || undefined}})
    },
    //退出登录按钮
    logout(){
      //派发action,通知vuex情况数据
      this.$store.dispatch('logout');
    }
  },
  mounted(){
     //监听removeKeyword事件
     this.$bus.$on('clearKeyword',()=>{
      this.keyword = '';
     })
  },
  computed:{
    ...mapState({
      nickName:state=>state.user.nickName
    })
  }
};
</script>

<style scoped lang="less">
.header {
  & > .top {
    background-color: #eaeaea;
    height: 30px;
    line-height: 30px;

    .container {
      width: 1200px;
      margin: 0 auto;
      overflow: hidden;

      .loginList {
        float: left;

        p {
          float: left;
          margin-right: 10px;

          .register {
            border-left: 1px solid #b3aeae;
            padding: 0 5px;
            margin-left: 5px;
          }
        }
      }

      .typeList {
        float: right;

        a {
          padding: 0 10px;

          & + a {
            border-left: 1px solid #b3aeae;
          }
        }
      }
    }
  }

  & > .bottom {
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;

    .logoArea {
      float: left;

      .logo {
        img {
          width: 175px;
          margin: 25px 45px;
        }
      }
    }

    .searchArea {
      float: right;
      margin-top: 35px;

      .searchForm {
        overflow: hidden;

        input {
          box-sizing: border-box;
          width: 490px;
          height: 32px;
          padding: 0px 4px;
          border: 2px solid #ea4a36;
          float: left;

          &:focus {
            outline: none;
          }
        }

        button {
          height: 32px;
          width: 68px;
          background-color: #ea4a36;
          border: none;
          color: #fff;
          float: left;
          cursor: pointer;

          &:focus {
            outline: none;
          }
        }
      }
    }
  }
}
</style>
